Mechanism for converting a web of flexible material into sheets



Dec. 29, 1925' J. A. CAMERON ET AL,

MECHANISM FOR CONVERTING A WEB OF FLEXIBLE MATERIAL INTO SHEETS 1924 :5 Sheets-Sheet 1 Filed Nov. 21 I Ue-c. 29, 1925' l,5fi7,706 J. A. CAMERON ET AL HANISM FOR CONVERTING A. WEB OF FLEXIBLE MATERIAL INTO SHEETS M EC Filed Nov. 21 1924 5 Sheets-Sheet 2 m V/szvmle's /l TTORNE Y Dec, 29., @925- J. A. CAMERON ET AL MECHANISM FOR CONVERI TNG A WEB 0F FLEXIBLE MATERIAL INTO SHEETS Fil ed Nov. 21

, 1924 3 Sheets-Sheet 3 WM mm b I N VlzN Tole:

A TTORNEY 2sec essaite JAMES, A. CAMERON, 0F BROOKLYN, YORK, AND ROBERT Me Il'fiHNSTONE, 032i BOfiELLE PARK, NEW JERSEY, ASSIGNORS T0 CAMERON TvIACHI'NE COMPANY, 9h BROOKLYN, NE'W-YORK, A CORPORATION OF NEW YORK.

MECHANISM FOR CONVERTING A WEB OF FLEXIBLE MATERIAL INTO SHEETS.

Application filed November 21, 1924. Serial No. 751,410.

To (all whom it may concern:

Be it known, that We, James A. CAMiinoN, a citizen or the United States, and a resi dent of New York city. in the borough of Brooklyn, county of Kings, and State of New York, and Ron'iin'r McC. JOHNSTONE, a citizen of the United States, and a-iiesident of Roselle Park, in the county of Union and State of New Jersey, have invented a certain new and useful Mechanism for Converting a Web of Flexible Material into Sheets, of which the following is a specitication.

This invention relates to a machine for converting a webot flexible material, such as paper board, into sheets.

Paper board, like other paper, is made by a continuous process and comes from the paper making machine, or the calendering rolls thereof, in the form of a continu- 0us Web The web is then slittecl longitudinally into sections and the latter are then severed transversely so that a constant stream of boards or sheets issues from the machine. The boards 01' sheets thus produced have rough edges and are not truly rectangular, in consequence of which they are not, as a rule, without first trimming the.edges thereof so as to reniove'their roughness and to square up the board itself. To carry on the trimming operation means extra expense and also results in wastage of thetrim.

It is the main object and'featuife of this invention to convert a web of flexible material, such as paper board, into sheets that are substantially rectangular and devoid of rough edges without the necessity of trim- 'ining them.

The invention consists primarily in using score-cut slitting devices to cut a web longitudinally into sections without distorting the sections out of paallelism, in employing feeding devices that engage the sections to exert an equal pullon all the sections to thereby advance them in parallelisin,"and w in employing severing devices to cut thesections substantially at right-angles to the r longitudinal advance.

proceeds. I

The invention is disclosed in several connsed commercially Other features 'ofinvention will appear as the specification Fig. 5 is a more or less diagrammatic side view of asecond modified form. of the nvention.

Fig. 6 IS a more or less diagrammatic side view, partly in section, of a third modified form of the invention.

Referring first to Figs. 1, 2 and 3, the slitting devices consist of a. rotatable smoothfaced backing member 1 having a glasshard surface against which acts score-cut SllttQI'SQ, driven by friction from member 1. The web 3 as it comes fromthe paper making machine or board inill is led be tween the slitting elements which cut the web longitudinally and the sections are then led to a suitable feeding device consisting here of pull rolls l and 5, after which the sections pass between rotating knife 6 and stationary knife 7 that constitute the trans-- verse severing device and which acts to sever the sections transversely into sheets or boards 8 that then drop on belt 9 and are conveyed to hopper 10.

The scorecut slitting device acts .to cut the web longitudinally into sections without distorting said sections out of paral elisni. This is diflerent from a construction employ ing a shear-cut slitting device, as heretotore used in sheeting machines, in that the shear-cut device, which consists of overlapping circular shears, necessarily distorts the web sections out of parallelism, as a result of which they cannot advance in parallelism to knives 6 and 7 and said knives cannot therefore sever the web sections to producerectangular sheets. Another disadvantage ofthc shear-cut'slitters is thatthe edges of the sheets "produced are rough, but TlilS difiiculty is entirely overcome by the score-cut slitters which produce smooth edges. The pull roll 4.- is here a driven element and roll 5 may be simply a pressure roll mounted in open bearings 11, the action of these rolls being to advance the web sections in parallelism to knives 6 and 7 so that transverse severance may be as nearly rectangular as possible'to the longitudinal cut tote, its speed, nevertheless, being preferably governed by the advancing web. It will be seen that, in this manner, the-speed of the pulling and the slittin means may be accurately coordinated. his it is not possible to do with a shear-cut device even if they are positively geared, because the diameter of the several cutters will be different owing to uneven wear and grinding, the consequence being that the amount of overlap will be dift'erent and therefore different speeds will be imparted to the edges of the difierent web sections. The shear cutters therefore will not merely distort the sections out of parallelism but will also affect the speed of the weral sections differently and will, in addition thereto, tear the board to compensate for the difference in speed. All these objection-- able features are avoided by the present device.

lihen itis desired to change the length of the sheets produced the frequency of rota tion of knife 6 is varied in the usual manner. Change in width of the sheet is effected by adjusting score-cut slitters 2 transversely of backing roll 1 in a. manner well understood.

In Fig. l, web 3 is shown passing through the drying" and calendering rolls 12 of a board mill after which it passes over guide .3 and between backing roll 1 and score-cut slilters 2. From thence it passes between pulling rolls 4 and 5, and thence to knives 5 and 7. Score-cut slitters 2 are here mount ed on. a rotatable member 14. and there are. two sets of them. that one set can be adguslcd while another set is operating. The machine shown. in Fig. 4 is disclosed and claimed in application so. No. 678,333, filed Dec. 3, 1923.

in Fig. 5 the oisclosurc is substantially the same as in Fig. t except that the web passes over guide 15 of the slitter, then around backing roll 1, then over guide 16" and thence to the pulling rolls; Scorecuts slitters 2, of which there are two sets, are here mounted on. a rocking member 17 so that when one set is thrown out another is thrown in. in '(lllS case also one set of cub LGI'S can be adjusted while another set of cutmemes tors are adjusted so that the chimge from one size to another can be efiected without interrupting the flow'gof the web. The machine shown in Fi 5 is disclosed and claimed in applicstmn Ser. No. 678,332, filed December 3, 1923.

In Fig. 6 is shown a modification of the form of the invention shown in Fig. 1. As there shown driver roll 18 constitutes a backing roll for the score-cut slitters 2, and t also constitutes a pulling roll meeting with pulling roll 5 to feed the paper through the machine. The form of the invention shown in Fig. 6 is claimed specifically in application Ser. No. 20,834, filed April 3, 1925.

We claim:

1. Mechanism for converting a web of flexible material iilto sheets includin score-cut slitting means to out a we throughout into longitudinally independent section's without distorting the sections out of parallelism, a feeding device engaging the sections to exert an e ual pull on all the sections to thereby advance them in parallelism, and severing devices to out the sections, simultaneously into a plurality of sheets substantially at right angles to their longitudinal advance. I

2. Mechanism for converting a web 0 flexible material into sheets including: score-cut slitting means to cut a. web throughout into longitudinally independent sections without distorting" the sections out of parallelism, pulling rollers engaging the sections to exert an equal pull on all the sections to thereby advance them in parallelism, and severing devices to out the sections, simultaneously into a plurality of sheets, substantially at right angles to their longitudinal advance.

3. Me hanism for converting a web of flexible material into sheets including: score-cutslitting means to cut a web throughout into longitudinally independent sections without distortin the sections out of parallelism, a feeding evice operating: at substantially the samesurface speed as the slitting means, engaging: the sections to exert an equal pull on all the sections to thereby advance them in parallelism, and severing devices to cut the sections, simultaneously into a olurality of sheets substantially at right angles to-their longitudinal advance.

Mechanism for converting. a web of flexible material into sheets including: slitting means comprising: smooth-faced rotatable backing means and score-cutters engaging and trictionally driven from said backing means, to out a web longitudinally into sections without distorting the section's out of parallelism, a feeding device engaging the sections to exert an equal pull on all the sections to thereby advance lthem in parallelism and to drive said backing means by traction of the advancing web, and severing devices to out the sections substantially at right angles to their longitudinal ad- Vance.

5. Slitting means including: smootl1- faced rotatable backing means, score-cuttens engaging and frictionally driven from said backing means, and a feeding devlce for advancing a web by pulling it between the baekin means and score-cutters and fol 19 driving saiol backing means by traction of engaging and frictionally driven from said backing means, and; pulling rollers for advancing a web by pulling it between the backing means and score-cutters and for driving said backing means by traction of the advancing web.

7. Mechanism for converting a web' of flexiblematerial into sheets including: slitting means having as one of its members a cylindrical-surfaced roll around which the web passes, a feeding device to exert an equal pull on all the sections later ally, and a severing device for cutting the we sections transversely.

Signed at New York city, in the borough of Brooklyn, county of Kings and State of New York, this 17 day ofNovember, 1924-.

JAMES A. CAMERON. ROBERT McC. JOHNSTONE. 

